I recommend a rice cooker, they are fairly cheap and very handy. Rice is really cheap in bulk and neutral enough to work with almost any dish. With a cooker you can make quick low effort carbs (filling) to accompany whatever else you have at hand. Dump it in a pan with some veggies, heat and stir. Perhaps add an egg or two, seasoning of course. A quite healthy and cheap meal, which is also very easy to make and can be adjusted to your tastes no problem.